of properties 1. WRITTEN OUTPUT (15 points) Multiple Choice Write the CAPITAL LETTER of your correct answer on the blank provided before each number A 1. Which of the following lists contains all pure substances? A. gold, oxygen, carbon dioxide C. squeezed orange juice, silver, soda water B. milk, water, copper D. tea, salt, concrete 2. Water boils at 100°C and pure ethanol at 78.5°C. Which of the following statements is FALSE about water and ethanol? A Water and ethanol have specific temperatures at which they would start to boil. B. Water and ethanol are pure substances C. Water and ethanol can be boiled either at 100 °C and 78 °C D. Water and ethanol can be identified according to the temperature at which they boil. 3. A clear and colorless liquid sample is placed in a beaker. There are no particles that settles at the bottom of the container and a beam of light can pass through it. Based from the given characteristics, the sample is a A Heterogeneous mixture C. Element B. Homogeneous mixture D. Compound 4. Distillation is a process used by water purifying stations to make pure and drinkable water The process uses heat to evaporate only the liquid water and leaves some heavy substances or other impurities. What idea can be drawn from this information? A. Distillation is not the only way to purify water B. Distillation is a process that can be used to separate impurities in water. C. The water that water purifying stations purify is 100% pure. D. Water is always drinkable because it contains minerals. 5. The following are examples of pure substances except A. acetic acid, 70% alcohol, carbon C. carbon dioxide, gold, silver B. oxygen, sodium chloride, water D. blood, air, lemon juice 6. During the temperature of a substance changes at the start then it becomes the same, while the temperature of a mixture is different at different times, A. melting B. boiling C. freezing D. evaporation 7. Marlyn heated an unknown solid material. After few seconds, the material started to melt at 35°C and finishes melting at 40°C. What is the characteristics of the material? A. The material is a pure substance. C. The material is a mixture. B. The material is a non-metal, D. The material is a metal, 8. Mark was given three unknown liquid samples. His observations were written in the table below. What inference can be drawn from his observation? | |
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1.A
2.B
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